Prefix plugin clones with the username so shared clones don't collide

Clones of omarchy.clock become dhh.clock instead of local.clock, so a
published clone carries its author's namespace. The clone command owns
the id derivation and gains --edit to open the result in $EDITOR, and
the shell exposes clonedFrom in listPlugins so the plugin menu no longer
reconstructs clone ids.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

default/omarchy-skill/SKILL.md

@@ -184,7 +184,7 @@ Clone it into the user plugin directory instead:
 
 ```bash
 omarchy plugin clone omarchy.workspaces
-# Edit ~/.config/omarchy/plugins/local.workspaces/; saved changes reload automatically.
+# Edit ~/.config/omarchy/plugins/<username>.workspaces/; saved changes reload automatically.
 ```
 
 **Commands:** `omarchy restart shell`, `omarchy refresh shell`
@@ -419,6 +419,6 @@ This skill intentionally does not cover Omarchy source development. Do not use t
 - "Clear all reminders" -> `omarchy reminder clear`
 - "Customize the catppuccin theme colors" -> Create `~/.config/omarchy/themes/catppuccin-custom/` by copying from stock, then edit
 - "Run a script every time I change themes" -> Install it with `omarchy hook install theme-set <script>`
-- "Change how workspace labels are rendered" -> Clone `omarchy.workspaces`, which switches the bar to `local.workspaces`, then edit the clone
+- "Change how workspace labels are rendered" -> Clone `omarchy.workspaces`, which switches the bar to `<username>.workspaces`, then edit the clone
 - "Lock after ten minutes" -> Set `idle.lock` to `600` in `~/.config/omarchy/shell.json`
 - "Reset shell/bar to defaults" -> `omarchy refresh shell`